package com.wx.house.common.util;

import javax.servlet.http.HttpServletRequest;

public class IpHelp {
public static IpHelp instance;

public IpHelp() {

}

public static IpHelp getInstance() {
	if (null == instance) {
		instance = new IpHelp();
	}
	return instance;
}

/**
 * 获取用户真实IP地址，不使用request.getRemoteAddr()的原因是有可能用户使用了代理软件方式避免真实IP地址,
 * 可是，如果通过了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP值
 *
 * @return ip
 */
public String getIpAddr(HttpServletRequest request) {
	String ip = request.getHeader("x-forwarded-for");
	System.out.println("x-forwarded-for ip: " + ip);
	if (ip != null && ip.length() != 0 && !"unknown".equalsIgnoreCase(ip)) {
		// 多次反向代理后会有多个ip值，第一个ip才是真实ip
		if (ip.indexOf(",") != -1) {
			ip = ip.split(",")[0];
		}
	}
	if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
		ip = request.getHeader("Proxy-client-IP");
		System.out.println("Proxy-client-IP ip: " + ip);
	}
	if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
		ip = request.getHeader("WL-Proxy-client-IP");
		System.out.println("WL-Proxy-client-IP ip: " + ip);
	}
	if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
		ip = request.getHeader("HTTP_CLIENT_IP");
		System.out.println("HTTP_CLIENT_IP ip: " + ip);
	}
	if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
		ip = request.getHeader("HTTP_X_FORWARDED_FOR");
		System.out.println("HTTP_X_FORWARDED_FOR ip: " + ip);
	}
	if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
		ip = request.getHeader("X-Real-IP");
		System.out.println("X-Real-IP ip: " + ip);
	}
	if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
		ip = request.getRemoteAddr();
		System.out.println("getRemoteAddr ip: " + ip);
	}
	return ip.equals("0:0:0:0:0:0:0:1") ? "localhost" : ip;
}
}
